* {
  padding: 0;
  margin: 0;
}
html,
body {
  height: 100%;
}
body {
  display: flex;
  flex-direction: column;
}
.section {
  flex: 1;
  overflow: auto;
  position: relative;
}
.section .sec {
  height: 100%;
}
.section .sec img {
  width: 100%;
  height: 100%;
}
span {
  position: absolute;
  top: 40%;
  left: 30%;
}
